Adding hydroxypropyl methyl cellulose (HPMC) to cement plastering can significantly improve the performance and application results of the plaster mortar. Its main functions are as follows:
1. Thickening Effect
HPMC significantly increases the viscosity of the plaster mortar, allowing it to adhere better to the wall surface and form a uniform, smooth coating. This helps reduce surface defects and improves the smoothness of the coating.
2. Water Retention Effect
HPMC has strong water retention properties, effectively holding the moisture in the plaster mortar, making the application smoother on the wall surface and reducing problems such as excessively rapid drying or cracking.
3. Improved Sagging Resistance
Adding HPMC enhances the sagging resistance of the plaster mortar, reducing sagging caused by gravity during application.
4. Enhanced Adhesion
HPMC exhibits superior adhesion to wall materials, resulting in a more secure and durable plaster coating that is less prone to peeling or flaking.
5. Improved Workability
The addition of HPMC simplifies plastering processes, reducing surface defects and improving coating smoothness.
6. Increased Tensile and Shear Strength
HPMC's high water retention in plaster mortar promotes thorough cement hydration, significantly increasing bond strength. It also appropriately enhances tensile and shear strength, greatly improving workability and efficiency.
7. Controlled Air Infiltration
HPMC controls air penetration, thereby eliminating microcracks in the coating and creating an ideal smooth surface.
8. Extends the workability of mortar. High water retention extends the workability of mortar, improves work efficiency, and helps the mortar achieve high mechanical strength during the setting period.
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